06/05/2026
Many avid birders might initially be more interested in the incredible diversity of bird species that visit and inhabit the Bay Area than in the rocks beneath them.
The bedrock beneath our landscapes shapes crucial conditions for life, including how water moves through an area, how soils support or restrict plant growth, and where vegetation can grow. 🪨 In Marin County, this unique geologic setting creates remarkable conditions for native plants and wildlife, including rare endemic species.
🐦 So, how do serpentine soils relate to birds? Complex, varied landscapes support more species with different habitat needs, and the rare plants that grow in serpentine soils play an unusual role in their ecosystems.
Serpentine grasslands are especially important for many native California birds, including Golden Eagles, Western Bluebirds, Horned Larks, and Grasshopper Sparrows.
Serpentine habitats across the Bay Area and California, including barrens, grasslands, and chaparral, also provide habitat for avian travelers along the Pacific Flyway, which stretches from Alaska to Patagonia.
This spring, as you’re enjoying singing songbirds and blankets of orange and yellow wildflowers, keep an eye out for the blue-green hues of California’s state rock (serpentine) - and for the plants and other wildlife that persist in these rocky soils. It’s also a perfect time to look more closely what the birds around you are up to 🔭 🪺California Bird Atlas Big Weekend kicked off today and runs through June 7! ✨ Consider joining the California Bird Atlas on eBird to log your breeding bird observations anywhere in California.
👉 And to learn how California’s thin, highly toxic serpentine soils create essential conditions for native plants, rare wildlife, and birds to thrive, tap the link in our comments.
📷 Western Bluebird carrying food. Photo: Marti Phillips/Audubon Photography Awards
